deleted file mode 100644
--- a/lib/isnanl.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/* Test for NaN that does not need libm.
-   Copyright (C) 2007 Free Software Foundation, Inc.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License along
-   with this program; if not, write to the Free Software Foundation,
-   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
-
-#if HAVE_ISNANL_IN_LIBC
-/* Get declaration of isnan macro or (older) isnanl function.  */
-# include <math.h>
-# ifdef isnan
-#  undef isnanl
-#  define isnanl(x) isnan ((long double)(x))
-# endif
-#else
-/* Test whether X is a NaN.  */
-# undef isnanl
-# define isnanl rpl_isnanl
-extern int isnanl (long double x);
-#endif